Thanks to Glyn, who sent in this picture of mystery eggs found in his garden, in a wet, cool spot under a concrete slab. They are in fact snail or slug eggs – I have no idea if it's possible to tell the difference easily. Presumably fairly big ones though.

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Slug eggs. The cue is that they are almost transparent. The calcium carbonate crystals in snails eggs – used to build their shells – makes them white. The location is also more consistent with a slug, as large garden snails dig in soil to lay eggs.